Pencil-sharpener.



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W/ TA/Essef Patented Dec. I6, |902.

D. F. OLIVER. Y

PENCIL SHARPENER. v I

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UNITED STATES PATENT OFFICE.

DOCTOR F. OLIVER, OFFRUITVALE, CALIFORNIA.

PENCIL-SHARPENER.

SPECIFICATION forming part of Letters Patent No. 715,849, dated December 16, 1902.

Application filedli'ehruary 10, 1902. Serial No. 93,318. (No model.)

To @ZZ whowt t may concern:

Be it known that I, DOCTOR F. OLIVER, a citizen of the United States, residing atFruitvale, county of Alameda, State of California, have invented certain new and useful Improvements in Pencil-Sharpeners; and I do hereby declare the following to be a full, clear, and exact description of the same.

The present invention relates to certain new and useful improvements in pencil-sharpeners, the invention residing more particularly in providing cutting means or knife which reciprocates in the are of a circle in the plane of the axis of the pencil, whereby the surface of the pencil'is gradually removed by a series of arc-shaped cuts tangential to the axis of the pencil. It also resides in means for holding the pencil within a movable thimble or ferrule, whereby the same is permitted rotation in one direction while being held locked against rotation in the opposite direction. The invention also relates to means for automatically rotating the pencil during the operation of sharpening the same, whereby a new surface of wood is presented to the cutting-knife at each stroke thereof.

To comprehend the invention, reference should be had to Ithe accompanying sheets of drawings, wherein- Figure 1 is a perspective view of the sharpener. Fig. 2 is a detail vertical sectional view through the thimble and supportingplates, the base-plate and planer being removed. Fig. 3 is a top planview of the mechanism disclosed in Fig.`1 of the drawings. Fig. 4 is a perspective view of the Sharpener,

the spring cover-plate or side wall which carries the clutch-cams being removed. Fig. 5

is a perspective View of the actuating or operating plate for the segment-pawls. Fig. 6 is a rear perspectiveview of the thimble and spring-plate, illustrating the slots through which the segment-pawls work. Fig. 7 is a top plan view of the mechanism set forth in Fig. 6 of the drawings, the pencil ferrule 0r thimble being in cross-section. Fig. 8 is a llongitudinal sectionalview of the planer-head and its lever, the planer-blade being in position; and Fig. 9 is a detail broken rear view of the planer-head.

In the drawings the frame consists of the base-plate 1 and the upright or support 2,

which parts are preferably formed integral. From" the upper portion of upright 2 forwardly extends the side plate 3, which plate near its outer edge is formed with the inwardly-projecting shoulders 4 5, located a distance apart. Y Through these shoulders pencil-openings a are formed, and between said shoulders is fitted the pencil ferrule or thimble 6. The upper and lower ends of this thimble rest in sockets or seats b, formed in the inner face of each shoulder-plate. These shoulder-plates 4 5 thus constitute supports for the ferrule or thimble, which is turnably held therebetween.

` In the ferrule or thimble 6 `near its upper and lower end the transverse slots `7 are formed, through which slots project the segmen t plates or pawls 8. These plates or pawls serve to rotate the pencil 9 within its ferrule or thimble, as will be hereinafter explained. The plates or pa wls 8 are attached to and projectat right angles from spring-wall 10 of a V- shaped piece of metal 11, Fig. 7 of the drawings, the opposite wall 12 being secured to the ferrule or thimble 6 in any suitable manner. The wall 10 being of spring metal, it is free to be moved inward and outward. From the lower outer end of the piece 1l projects the lug 13, which lug or extension Works within an inclined slot 14, formed in the operating-plate 15. This plate is attached or hinged at its lower end to the upwardlycurved spring-plate 16, which spring-plate is secured to the base-plate 1. The outer end portion 17 of said spring-plate is also upwardly curved and its end bears against the under face of lever 18, so as to hold the same up or in a raised position. This lever is hinged at its outer end between the arms a of base-plate 1, and to the inner endof said lever is secured the curved planer-head 19. This head is arranged to swing in an arc tangential to the axis of the pencil. Through the knife-opening h of said head is itted the planer blade or knife 20, the cutting edge of which projects slightly beyond the face of the planer-head and stands at an inclination to the vertical axis of the pencil. Said blade or knife is held in proper position by means of set-screw 21.

With each downstroke of the planer-head the planer knife or blade will cut into and IOO remove a portion of the exposed surface of the pencil. However, as the planer moves in the arc of acircle in a plane including the` axis of the pencil the cuts will be upon an arc tangential to the axis of the pencil, the blade cutting into the pencil from its circumference to its axis with a gradual sweep, so that the radial section of the point when completed will be bounded at its sides by two converging concave curves meeting at the axis of` the pencil. Thus with each downstroke of the planer-head the cutting-blade moves` into and gradually out of the exposed surface of the pencil. The downward movement of the planer blade or knife is limited by the shoulders 22, which bear or impinge against the surface of the blade after same has moved downward a given distance, thus preventing the blade projecting too far beyond the face of the planer-head. In order to permit of an inward adjustment or feed of the planer-head with each downward movement, slight longitudinal play is permitted the lever 18 by means of the elongated opening d, formed in the outer end portion thereof and through which securing-pin d passes. This radial movement is essential in order that each cut of the knife or planer may progressively advance toward the axis of the pencil,

To hold the planer-head in true position, the same works between guide-arms 7L, projecting from the lower supporting-plate 5, Figs. 1, 3, and 4 of the drawings.

To the vertical support or upright 2 there is bolted or otherwise secured what I shall term a cover-plate or spring side wall 23, which carries the clutch-cams 24 and 25. These cams work above and below the segment plates or pawls 8 and partly cover the supporting-plates 4 5. The inner edge of each cam extends a slight distance beyond the pencil-openings a, so as to bear against the surface of the pencil 9 placed therein. In each cam an inclined slot h' is formed, through which extends a pin h2, projecting from the supporting-plates 4 5. The drawings only illustrate one slot h and one projecting pin 71,2. These pins serve to limit the inward or outward movement of the clutchcams.

To insert the pencil 9 within the ferrule or thimble 6, the plate or side Wall 23 is forced inward. This movement of the plate or wall carries the clutch-cams away from the pencilopening and gives clearance for insertion of the pencil into the thimble. When properly inserted, the wall or plate 23 is released, when the same springs outward and forces the clutch-cams firmly against the surface of the pencil, the pressure of which is sufiicient to cause the pencil to bear firmly against the inclined shoulders 26 of the pencil-opening. As thus secured or locked within the thimble or ferrule any attempt to turn or rotate the pencil inward or toward the wall or plate 23 only serves to cause the clutch-cams to bear harder upon the pencil, and thus lock the pencil tighter within the thimble. As the clutchcams move in the arc of a circle, pencils of varying size may be used in connection with the thimble. A reverse movement or turn may be given to the pencil, as the clutch-cams will give to such pressure exerted thereon and permit of the pencil being rotated outwardly or away from the wall or plate 23, for in such case the tendency of the pressure is to release the said cams. It will be linderstood that as the side wall 23 is forced inward it bears against wall 10 and carries the same therewith, thus moving the segmentpawls with the clutch-cams in order to give clearance for insertion of the pencil. These pawls move into engagement with the pencil when pressure thereon is released. By preference the curved edge of these pawls is serrated, so as to grasp the pencil and hold same firmly.

The pencil-openings a have their walls inclined, so as to give a sharp edge a2, which when the pencil is pressed thereagainst bite into the surface of the pencil and hold same against downward movement, thereby preventing slipping thereof during the operation of sharpening the projecting end thereof.

With each full downstroke of the lever 18 the planer-head is forced against spring-plate 15 and moved downward, carrying therewith the operating-plate 15. As the plate moves downward stud or plug 13 rides within slot 14 and is gradually forced inward toward plate 23, swinging therewith plates or segment-pawls 8 and imparting an oscillating movement or part rotation to the thimble or ferrule 6. During this movement of the thimble or ferrule the pencil is held stationary or against movement therewith by the pressure of the clutch-cams 24 25, the segment-pawls slipping over the surface thereof. The moment lever 18 is released it is forced upward by the pressure of outer portion 17 of spring-plate 16, while at the same time the inner end of said spring-plate moves upward by its own resiliency. As moved upward it raises the operating-plate 15 and imparts an opposite throw to the segment-pawls 8 and thimble 6. During this movement of the thimble the clutch-cams ride upon the face of the pencil, while the segment-pawls 8 engage therewith and cause the pencil to turn with the thimble. A new surface is thus presented to the action of the knife-blade or planer. During one movement of the thimble the pencil is held locked thereto and turns therewith, while upon an opposite throw being imparted thereto the pencil is held stationary.

The pressure of outer portion 17 of springplate 16 not only serves to hold the planeriever in a raised position, but bearing, as it does, against shoulder 27 keeps the planerhead held up to the pencil being sharpened.

IOO

IIO

The length of point to be given to the pencil depends upon the distance it projects beyond the ferrule or thimble.

Having thus described the invention, what is claimed as new, and desired to be protected by Letters Patent, is-

l l. In a pencil-Sharpener, the combination with pencil-holding instrumentalities, of a pivoted blade or planer radially movable toward and from the pencil-holding means; substantially as described.

2. In a pencil-Sharpener, the combination of a pencilholder,of means for oscillatin g said holder, instrumentalities arranged to hold the pencil against movement during the movement of the holder in one direction and to release said pencil during the movement of the holder in the other direction, and a cutter blade or planer; substantially as described.

3. In a pencil-Sharpener, the combination of a pencil-holder, means for oscillating said holder, means associated with said holder for securing the pencil in the holder during the movement of said holder in one direction, and releasing the pencil during the movement of the holder in the other direction, and a cutter-blade; substantially as described.

4. In a pencil-Sharpener, the combination with a frame of a pencil-thimble mounted therein, means for oscillating said thimble, means operatively associated with said thimble for intermittently securing the pencil therein, and cutting devices; substantially as described.

5. In a pencil-Sharpener, the combination of a frame, a pencil-thimble mounted therein, means for oscillating said thimble, means for holding the pencil against movement during one movement of the thimble, means for securing the pencil in the thimble to move therewith during the reverse movement thereof, said means being arranged to operate alternately, and cutting devices carried by the frame; substantially as described.

6. In a pencil-Sharpener, the combination of a frame, a reciprocating cutter mounted therein, a pencil-thimble carried by the frame, means for oscillating said thimble, instrumentalities associated therewith for alternately securing the pencil in and releasing it from the thi m ble, means for securing the pencil in fixed position when released from the thimble and means operated bythe cutter for actuating the oscillating and securing means; substantially as described.

7. In a pencil-Sharpener, the combination with a frame, having pencil-apertures therein, a pencil-thimble mounted in the frame in alinement with said apertures, means for oscillating the thimble, cams for securing the pencil against movement relativeto the frame, cams for securing the pencil against movement relative to the thimble, means for alternately operating the cams, and cutting devices carried by the frame arranged to actuate the operating means; substantially as described.

In witness whereof I have hereunto set my hand.

' DOCTOR F. OLIVER.

Witnesses:

N. A. ACKER, D. B. RICHARDS. 

